[lib] Enable NUX for staff

Summary:
Turn the flag on for staff and dev.

https://linear.app/comm/issue/ENG-9111/remove-the-flag-once-we-are-ready-to-launch-nux

Test Plan: Open the app and check if NUX is performed.

Reviewers: kamil, inka

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13337